What nut file set for ?

Nut and Saddle Tools guitar nut slot files Hosco Guitar Nut Slotting Files Review Highline Guitars•15K views · 16 Quick Tip 11: Filing a guitar nut slot files Wosion Bovine bone primary color Acoustic guitar ，Classical guitar nut slotted, upper and lower nuts slotted in various sizes。 Free shipping over US $10

guitar nut slot Nut Slot combined Chisel and File from Summit 3mm wide Nut Slot combined Set of 3 Hosco Nut Files for Bass Guitar Bass Nut Files Set of 3 · Bass Nut